Shows target's class centered above target portrait. Only shows class for real people, not NPCs or pets. The class is displayed instantly upon targetting them.
This is useful for battlegrounds. No more trying to identify people by looking at their helm-covered heads. No more realizing you are attacking a paladin when you could have been killing a rogue. No more trying to figure out if the cat you have targetted is a hunter pet or a druid.
Updated the toc for WofLK, no other changes, still works perfectly.